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<head><meta charset="utf-8"><title>Regression issues · t-libs · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/index.html">t-libs</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html">Regression issues</a></h3>

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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244681122" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Mara <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244681122">(Jul 02 2021 at 09:54)</a>:</h4>
<p>Hey <span class="user-group-mention" data-user-group-id="4493">@T-libs</span>,</p>
<p>There are quite a few T-libs issues open that are marked as a regression that might be outdated/already fixed. Many have been open for several years. If anyone has time: it'd be good to go over them and check which ones are still relevant:</p>
<p>- [<a href="https://github.com/rust-lang/rust/issues/31407">31407</a>] <code>P-medium</code> <em>Float parsing can fail on valid float literals</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/44048">44048</a>] <code>P-low</code> <em>Support all formatting flags in \`std::path::Display\`</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/47321">47321</a>] <code>P-low</code> <em>Performance regression on nightly (when using Cursor::read\_exact and Byteorder)</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/53340">53340</a>] <em>Performance regression in tight loop since rust 1.25</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/53823">53823</a>] <code>P-medium</code> <em>Binary search performance regressed in 1.25</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/60375">60375</a>] <code>P-high</code> <em>Regression: Typemap type mismatch in 1.34.0+</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/62439">62439</a>] <em>1.65x performance regression from 1.35.0 to 1.36.0</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/67599">67599</a>] <code>P-medium</code> <em>Backtrace is \&lt;unknown\&gt; for dynamic library loaded through dlopen using absolute file path for rust \&gt;= 1.37.0 on OSX</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/71359">71359</a>] <code>P-medium</code> <em>Regression in usable type complexity: overflow representing the type \`...\`</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/73030">73030</a>] <code>P-high</code> <em>\[stable regression\] #\[should\_panic\] tests segfault in certain OS X configurations with 1.44.0</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/78713">78713</a>] <code>P-medium</code> <em>regression: \`panic!\` and RUST\_BACKTRACE=1 Show Wrong &amp; Non\-Informative Function Names when Unwinding</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/80804">80804</a>] <code>P-high</code> <em>1.49 seems to have bumped required macOS version</em><br>
  - [<a href="https://github.com/rust-lang/rust/issues/83528">83528</a>] <code>P-low</code> <em>Writing to \`stdout\` with \`write()\` changed behavior between version 1.47 and \&gt;= 1.48</em></p>



<a name="244758237"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244758237" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> The 8472 <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244758237">(Jul 02 2021 at 21:14)</a>:</h4>
<p>I may have an improvement for <a href="https://github.com/rust-lang/rust/issues/53340">#53340</a></p>



<a name="244769584"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244769584" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> inquisitivecrystal <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244769584">(Jul 03 2021 at 00:03)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/80804">#80804</a> hasn't been fixed, though <a href="https://github.com/rust-lang/rust/issues/85953">#85953</a> is open for it.</p>



<a name="244769646"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244769646" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> inquisitivecrystal <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244769646">(Jul 03 2021 at 00:04)</a>:</h4>
<p>It might be a good idea for y'all to assign a libs team member to each <code>P-high</code> issue? I know the compiler team does that.</p>



<a name="244792699"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244792699" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> The 8472 <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244792699">(Jul 03 2021 at 09:06)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/86761">#86761</a> says it'll fix <a href="https://github.com/rust-lang/rust/issues/31407">#31407</a></p>



<a name="244831249"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244831249" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> bstrie <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244831249">(Jul 04 2021 at 00:10)</a>:</h4>
<p>I went over a fair number of these and left comments</p>



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<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244852162" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> The 8472 <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244852162">(Jul 04 2021 at 10:11)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/47321">#47321</a> is fixed for examples provided by the reporter, I asked a me-too commenter whether it's still an issue for him.</p>



<a name="244852561"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244852561" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> The 8472 <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244852561">(Jul 04 2021 at 10:23)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/83528">#83528</a> would be fixed by <a href="https://github.com/rust-lang/rust/issues/78515">#78515</a> but the PR has rotted due to the slow reviews/merge conflict/busy author vicious circle. The PR has been pinged recently, let's see if we get an update.</p>



<a name="244862235"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/219381-t-libs/topic/Regression%20issues/near/244862235" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> The 8472 <a href="https://rust-lang.github.io/zulip_archive/stream/219381-t-libs/topic/Regression.20issues.html#244862235">(Jul 04 2021 at 14:36)</a>:</h4>
<p>closed <a href="https://github.com/rust-lang/rust/issues/47321">#47321</a> since it no longer reproduces</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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